12408781 has 16 divisors (see below), whose sum is σ = 16007040. Its totient is φ = 9334080.

The previous prime is 12408779. The next prime is 12408787. The reversal of 12408781 is 18780421.

It is not a de Polignac number, because 12408781 - 2¹ = 12408779 is a prime.

It is a super-2 number, since 2×12408781² = 307955691811922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12408787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546 + ... + 5011.

It is an arithmetic number, because the mean of its divisors is an integer number (1000440).

Almost surely, 2^12408781 is an apocalyptic number.

12408781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12408781 is a deficient number, since it is larger than the sum of its proper divisors (3598259).

12408781 is a wasteful number, since it uses less digits than its factorization.

12408781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5604.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 12408781 is about 3522.6099698945. The cubic root of 12408781 is about 231.5135280623.

The spelling of 12408781 in words is "twelve million, four hundred eight thousand, seven hundred eighty-one".